14. Types of Bridges (1/15) - roxburyscience - Free Printable

It looks like you've uploaded a worksheet titled "Types of Bridges" that outlines five different types of bridges, their structural features, and the maximum spans they can cover. The task appears to be understanding and comparing these bridge types based on their design, function, and span capabilities.

Let’s go through each bridge type, explain its characteristics, and summarize the key points.

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🔹 1. Beam Bridge

- Description: A horizontal beam supported at both ends by piers.
- Forces Involved:
- Tension (in the bottom of the beam)
- Compression (in the top of the beam)
- Span: Up to 200 ft (60 meters)
- Use Case: Short spans, such as over small rivers or roads.
- Pros: Simple and inexpensive to build.
- Cons: Limited span due to bending forces.

✔ Best for short distances where cost and simplicity are priorities.

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🔹 2. Arch Bridge

- Description: Curved structure that transfers weight outward to abutments (supports).
- Forces Involved:
- Compression along the arch
- Span: Up to 800–1000 ft (240–300 meters)
- Use Case: Medium-length spans over valleys or rivers.
- Pros: Strong under compression; durable.
- Cons: Requires strong foundations to resist outward thrust.

✔ Excellent for medium spans with solid ground support.

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🔹 3. Suspension Bridge

- Description: Deck hangs from cables suspended between two tall towers.
- Forces Involved:
- Tension in cables and suspenders
- Compression in towers
- Span: Longest of all types – 100 to 2000 meters (330 to 6500 ft)
- Use Case: Very long spans, e.g., across wide oceans or deep gorges.
- Pros: Can span extremely long distances.
- Cons: Expensive and complex to construct.

✔ Ideal for very long spans like Golden Gate or Brooklyn Bridge.

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🔹 4. Cable-Stay Bridge

- Description: Cables run directly from the deck to the towers (no main cable system).
- Forces Involved:
- Tension in cables
- Compression in towers
- Span: 500–2,800 ft (150–850 meters)
- Use Case: Long spans but less than suspension bridges.
- Pros: More economical than suspension bridges; faster construction.
- Cons: Less flexible than suspension bridges.

✔ Good balance of strength and cost for long spans.

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🔹 5. Truss Bridge

- Description: Framework of triangular units above the deck.
- Forces Involved:
- Tension and compression in truss members
- Span: 40m to 500m (130–1640 ft)
- Use Case: Railroads, highways, and moderate spans.
- Pros: Strong and efficient load distribution.
- Cons: Can be visually bulky.

✔ Strong and versatile for medium spans with heavy loads.

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✔ Summary Table:

| Bridge Type | Max Span | Key Forces | Best For |
|-------------------|------------------|-----------------------|----------------------------------------|
| Beam Bridge | 200 ft (60 m) | Tension & Compression | Short spans, simple crossings |
| Arch Bridge | 800–1000 ft | Compression | Medium spans with solid supports |
| Suspension Bridge | 100–2000 m | Tension & Compression | Longest spans (e.g., ocean crossings) |
| Cable-Stay Bridge | 500–2800 ft | Tension & Compression | Long spans, cost-effective |
| Truss Bridge | 40–500 m | Tension & Compression | Heavy loads, moderate spans |

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🧠 Key Concepts:

- Tension: Pulling force (stretches material).
- Compression: Pushing force (squeezes material).
- Bridge Span: The distance between two supports.
- Design Choice: Depends on span length, terrain, budget, and load requirements.

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🎯 Task: What is the purpose of this worksheet?

This worksheet helps students:
- Identify different bridge types.
- Understand how forces (tension/compression) affect design.
- Compare bridge spans and applications.
- Learn real-world engineering principles.

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